After 3.c4 I think 3. ... e5 is strong as you already stated in another thread. You said that it is more difficult to counter in the center than usually in the wing gambit but the opening of Hector-Kudrin,1989 looked convincing to me. As white has wasted a tempo with 3.c4, there is no direct need for quick counterplay.
Some weeks ago I discovered some new ideas in the wing gambit and since then I have played some games with it online.
The outcomes were mixed, but my overall score is not worse than with the open sicilian.
I discovered an old post from MNb where he wrote about the gambit:
MNb wrote on 01/27/06 at 20:39:32:
For this reason and for fun I have tried to make the Sicilian Wing Gambit work. As one might expect I found theory wanting. Here are two problem lines:
1.e4 c5 2.b4 cxb4
3.a3 d5 4.exd5 Qxd5 (Nf6 5.axb4 Nxd5 6.d4!?) 5.Nf3 e6 (e5 6.c4 or 6.Bb2 gives White decent compensation) 6.axb4 Bxb4 and White's best chance might be 7.Bb2 Nf6 8.Nc3 Qd8 9.Bc4 o-o 10.o-o, but I don't think it is enough.
3.d4 d5 4.exd5 Nf6 (Qxd5 5.Nf3 or even 5.c4 is less clear now) 5.Bb5+ Bd7 6.Bc4 Bf5 and Abelleyro-Arregui, Villa Ballester 1993, was better for Black.
I think he is right when saying that white gets decent compensation with 3.a3 d5 4.ed5: Qd5: 5.Nf3 e5 6.c4!, this is very much fun for white, at least in blitz!
I found a game by Ruslan Sherbakov where he beat 5. ... e6 :
[Event "Pune op"]
[Site "Pune"]
[Date "2004.09.03"]
[Round "1"]
[White "Sherbakov,Ruslan"]
[Black "Das,Arghyadip"]
[Result "1-0"]
[Eco "B20"]
1.e4 c5 2.b4 cxb4 3.a3 d5 4.exd5 Qxd5 5.Nf3 e6 6.Bb2 Nf6 7.Bd3 Nc6 8.0-0 Be7
9.Re1 0-0 10.Ne5 Bd7 11.axb4 Nxb4 12.Nc3 Qd4 13.Be4 Qb6 14.Nxd7 Nxd7 15.Bxh7+ Kxh7 16.Qh5+ Kg8 17.Na4 Qd6 18.Bxg7 Kxg7 19.Qg4+ Kf6 20.Nc3 Nc5 21.Re3 Qc6 22.Qf4+ Kg6 23.Rg3+ Kh7 24.Qg4
1-0
An excellent attacking game!
BTW, does Ruslan visit the forum from time to time? Perhaps he could share some thoughts about that game!
To me that looks as if white gets quite some pressure for the pawn with this Bb2,Bd3,Re1,Ne5- plan.
The variation I found least comfortable for white is 3.a3 d5 4.ed5: Nf6!?
Now white can restore material equality by 5.ab4: Nd5: 6.c3, but somehow that is ugly.
MNb, how should white continue after 5.d4 Nb4: ?